US4666558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for newspaper deinking using low-foaming surfactant deinking agent
Assignee: HELLER FINANCIAL Inc AS AGENT
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Filing: 1985-12-11
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Granted: 1987-05-19
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Expires: 2005-12-11
Abstract
Abstract A process for the deinking of waste newsprint, which comprises steps for (a) converting the waste newsprint to a pulp, (b) contacting and agitating the pulp in an aqueous medium containing a deinking agent comprising a mixture of (i) a water-soluble C9 to C16 alkanol ethoxylate component having an average of about 6.5 to 20 oxyethylene units per ethoxylate molecule and (ii) an oil-soluble C9 to C16 alkanol ethoxylate component having an average of about 0.5 to 3.5 oxyethylene units per ethoxylate molecule, said mixture containing the respective components (i) and (ii) in a relative weight ratio in the range from about 2:1 to 1:3, and said mixture being present in said aqueous medium in an amount between about 0.1 and 5 percent by weight based on the dry weight of the newsprint fiber, and (c) recovering deinked pulp from the aqueous medium. The invention offers high performance in the removal of ink from pulp fibers and substantially eliminates the foaming of aqueous surfactant solution. Foaming has been recognized as a problem in conventional deinking processes employing deinking agents containing alcohol ethoxylate surfactants.
Inventors
- 👤 Donald L. Wood
- 👤 Louis Kravetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:17
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; D21C5/025; D21C5/027; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
147 words
A process for the deinking of waste newsprint, which comprises steps for (a) converting the waste newsprint to a pulp, (b) contacting and agitating the pulp in an aqueous medium containing a deinking agent comprising a mixture of (i) a water-soluble C 9 to C 16 alkanol ethoxylate component having an average of about 6.5 to 20 oxyethylene units per ethoxylate molecule and (ii) an oil-soluble C 9 to C 16 alkanol ethoxylate component having an average of about 0.5 to 3.5 oxyethylene units per ethoxylate molecule, said mixture containing the respective components (i) and (ii) in a relative weight ratio in the range from about 2:1 to 1:3, and said mixture being present in said aqueous medium in an amount between about 0.1 and 5 percent by weight based on the dry weight of the newsprint fiber, and (c) recovering deinked pulp from the aqueous medium.
Claim 2
Dependent Claim
147 words
A process for the deinking of waste newsprint, which comprises steps for (a) converting the waste newsprint to a pulp, (b) contacting and agitating the pulp in an aqueous medium containing a deinking agent comprising a mixture of (i) a water-soluble C 9 to C 16 alkanol ethoxylate component having an average of about 6.5 to 20 oxyethylene units per ethoxylate molecule and (ii) an oil-soluble C 9 to C 16 alkanol ethoxylate component having an average of about 0.5 to 3.5 oxyethylene units per ethoxylate molecule, said mixture containing the respective components (i) and (ii) in a relative weight ratio in the range from about 2:1 to 1:3, and said mixture being present in said aqueous medium in an amount between about 0.1 and 5 percent by weight based on the dry weight of the newsprint fiber, and (c) recovering deinked pulp from the aqueous medium.
Claim 3
Dependent Claim
24 words
The process of claim 1, wherein the respective weight ratio of components (i) and (ii) is in the range from about 1.85:1 to 1:2.
Claim 4
Dependent Claim
23 words
The process of claim 2, wherein the water-soluble alkanol ethoxylate has an average of about 7 to 15 oxyethylene units per ethoxylate molecule.
Claim 5
Dependent Claim
23 words
The process of claim 3, wherein the oil-soluble alkanol ethoxylate has an average of about 1 to 3 oxyethylene units per ethoxylate molecule.
Claim 6
Dependent Claim
24 words
The process of claim 4, wherein the respective weight ratio of components (i) and (ii) is in the range from about 1.6:1 to 1:1.
Claim 7
Dependent Claim
23 words
The process of claim 5, wherein the water-soluble alkanol ethoxylate has an average of about 8 to 13 oxyethylene units per ethoxylate molecule.
Claim 8
Dependent Claim
23 words
The process of claim 6, wherein the oil-soluble alkanol ethoxylate has an average of about 1.5 to 3 oxyethylene units per ethoxylate molecule.
Claim 9
Dependent Claim
21 words
The process of claim 7, wherein the water-soluble and the oil-soluble ethoxylates are ethoxylates of C 11 to C 15 alkanols.
Claim 10
Dependent Claim
35 words
The process of claim 1, wherein the aqueous medium contains between about 1 and 5%w of pulp and step (b) of the process is carried out at a temperature between about 70° and 130° F.
Claim 11
Dependent Claim
34 words
The process of claim 4, wherein the aqueous medium contains between about 1 and 5%w pulp and step (b) of the process is carried out at a temperature between about 70° and 130° F.
Claim 12
Dependent Claim
34 words
The process of claim 7, wherein the aqueous medium contains between about 1 and 5%w pulp and step (b) of the process is carried out at a temperature between about 70° and 130° F.
Claim 13
Dependent Claim
34 words
The process of claim 8, wherein the aqueous medium contains between about 1 and 5%w pulp and step (b) of the process is carried out at a temperature between about 70° and 130° F.
Claim 14
Dependent Claim
23 words
The process of claim 12, wherein the water-soluble and oil-soluble ethoxylates have both been derived from alkanols which are predominantly linear and primary.
References Cited (Backward Citations)
US3808089A
Cited
US4162186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |